Thanks for all the info guy's! That makes a lot of sense with the brass availability. I think if I want to aim for the 90grains to start I think I should maybe consider going the 22CM route to get good velocity in a hunting length barrel. I really do love the Lapua small rifle primer brass in my 6CM! That 6 CM with the 115gn Berger hunting bullets absolutely flattens white tails, but I don't really like hauling around my 16 pound PRS rig in area's I can't even see 250 yards.
Now that both my boys and my wife are hunting every rifle season I get downgraded to whatever rifle is leftover- I don't have much faith in the AR for killing deer- the 338 and 7mm are too much gun ECT...